Before

This is the vanilla swords, which would appear for people that doesn't have the resourcepack on, or people who haven't renamed their weapons. If you have another resourcepack on, which replaces the vanilla swords, then they will appear instead.

After

This is how the halberds look like, these will be shown if you've renamed your swords to be named something with the word "halberd," and doesn't replace the vanilla swords unless renamed.

Examples of Halberds being held